A paperwhite is a good option since you can use the RTC to enter deep sleep and run one of these off battery. I did it with a kindle 4 personally(but couldn't u

A paperwhite is a good option since you can use the RTC to enter deep sleep and run one of these off battery. I did it with a kindle 4 personally(but couldn't use RTC) and the code is available: https://github.com/davidhampgonsalves/life-dashboard https://github.com/davidhampgonsalves/life-dashboard